Muffler



H. ANDRESEN.

MUFFLER..

APPLICATION FILED MAY 24, I9I7.

Patented Sept. 7, 1920.

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50 45 f4 57 I, Y x PF4? f 9' 59A" 40 2.-..--. I* I 4J I /IV VEN TOR UNITED STATES.m

nPATENT OFFICE.

yH'AITOCR. ANDRESEN, OF NEW YORK, N. Y., ASSIGNOR TO THE VACUUM MUFFLER CORPORATION, OF NEW YORK, `N'. Y., A CORPORATION 0F NEW YORK.

MUFFLERL Specification of Letters Patent.

Patented Sept. 7, 1920.

Application led May 24, 1917. Serial No. 170,626.

To all whom t may concern.'

Be it known that I, HALVOR ANDREsEN, a subject of thev King of Norway, and a resident of the borough of Manhattan, in the city of New York, county and State of New York, have invented new and useful Improvements in Mufflers, of which the following is a specification.

The invention relates to mulilers or other noise reducing mechanism for use with in ternal combustion engines or in fact for use with any engine or device that has an intermittent discharge into an atmosphere having a lower pressure than that of the discharge.

According to the present invention gases or fluids flowing from the engine pass into a tubular member, arbitrarily referred to as a longitudinally-extending tubular-casing member.

ber that in effect serves as a diaphragm which is substantially inclined toward the longitudinal axis of the tubular member. The diaphragm member approaches the inner walls of the tubular member so that there is provided only a narrow slit or passageway through which the gases pass. Said diaphragm member has been given the substantial inclination just referred to in order that the slit through which the gases pass may be of a greater length than would be the case if the diaphragm member extended at substantially right angles to the longitudinally extending axis.

It will be manifest that if the angle of inclination of the diaphragm member toward the longitudinally extending axis is sulliciently acute the cross-sectional area of the passageway or space defined by the interior walls of the tubular member on the one hand and the diaphragm member on the other hand can be made equal to the cross-sectionalarea of the tubular member. In other words, there will be no substantiahrestriction of the area of the passage way through the tubular casing member even though the diaphragm member is located in said tubular casing member. The passing of the gases through this narrow slit or passageway causes a more or less uniform flow or mufiling of the gases through the muiller.

As illustrating certain embodiments of In flowing through or from this tubular member the gases pass' a memthe invention reference is made to the draw ings forming a part of this specification, in which draw1ngs Figure 1 is a longitudinal sectional view of one form of muilier.

Fig. 2 is a view taken as along the line 2 2 of Fig. l looking in the direction of the arrows.

Fig. 3 is a View taken asy on the line 3 3 of Fig. 2, looking in the direction of the arrows.

Fig. 4 is a longitudinal sectional view of another form of muffler.

Fig. 5 is a view taken as on the line 8 8 of Fig. 4 looking in the direction -of the arrows.

Fig. 6 is a longitudinal sectional view of another form of muffler.

In the form shown in Fig. l the longitudinally extending casing member or tubular member is designated by l and to this there is secured, as by 'means 2, a member 3 that serves as a diaphragm member. The particular portion of the member 3 which serves as the diaphragm is that designated by 4, 5, 6, 7, 4. This member 3 approaches, as will be manifest from an inspection of Fig. .2, the inner wall or walls of the tubular member l leaving, however, a relatively narrow and long space 8. The width Z) of this space is shown in Fig. 2 and the length thereof, it will be observed, is the elliptical peripheral portion 4, 5, 6, 7, 4. The width Z) shown in Fig. 2 has two millimeters or less, as will hereinafter appear. The rear side of the member 3 tapers to a point so that there can be a gradual expansion of the gases after they pass the diaphragm, and in the construction shown in Fig. l there is also provided a spiral deflector 9. At the forward end'of the diaphragm member 3 there is secured a ,member 10 which is the member referred to in some of the claims as the third member, although this member 10 might well be considered as a part of the diaphragm member 3 since it is secured to said member 3, as by means of bolts and screws 1l and l2.

The members 3 and 10 are separated from each other a slight distance, as will be readily seen fromfan inspection of Fig. 3, and water is supplied to said space through openings 13 that are in a water supply pipe 14. The flow of water into this space can in a way control and assist the flow of gases past the diaphragm member 3 and can also be em loyed to cool the gases.

ln ig. 4 the longitudinally extending casing member of the muffler is designated as 26 and there is held in place, by means of pins 27 and 28, the diaphragm member 29 that is inclined so as to make an acute angle with the longitudinally extending tubular portion 26. The member 29 provides the diaphragm which is elliptical in form and which is designated by 30, 31, 32, 33, 30. lnorder that the gases after flowing past the diaphragm may expand more o r less uniformly there has been provided inclined walls 34, 35.

According to the construction shown in Fig. 6 the longitudinally extending casing member may be considered to comprise an outer casingomember 36 and an intermediate casing mem er 37. Passageways 38 are provided so as to permit the flow of some of the gases from the interior of the intermediate casing member 37 to the space between said intermediate casing member 37 and the exterior casingmember 36. The diaphragm member is designated as 39 and is held in .place as by pins 40 and 41. The forward end of the member 39 provides the diaphragm portion 42, 43, 44, 45, 42 that approaches the terminal of the intermediate member 37. rl`he terminal of the intermediate member 37 may be considered as providing a second diaphragm member that is associated with the filler 46 secured to the interior of the exterior casing member 36 by the pins 40 and 41. That part of the intermediate member 37 which may be considered as a diaphragm member is designated as 47, 48 and 49; only one-half of this intermediate member and casing member are shown, as Fig. 6 is a\ Vin any suitable manner a member 50 which is referred to in the claims as the third member of the muffler and this member 50 may be spaced from the member 39 in a similar manner to that in which the corresponding members are spaced in Fig. 1. ln Fig. 6, however, these members are shown as integral and part of the same construction. Within the delivery end of each of the mufflers shown in Figs.` 4 and 6 there is provided any suitable filler, such as a bundle of wire that is relied upon to further iron out the explosive noises resulting from the outgoing gases. The bundle of wire may protrude from said delivery end in order that it may be cooled and so that it may cool the gases passing therethrough.

lln all the forms shown it will be observed that the diaphragm providing portion in effect is substantially inclined toward the longitudinally extending axis of the member with which it is associated and that there :is provided between it and the tubular member Q nearest with which it is associated a relatively 'long narrow slit-or this might be a series of slits-through which the gases flow in passing` through or from the muffler.

he construction of each muffler described is such that the smallest area for the fiow of gases through the muler is the area between the inclined diaphragm on the one hand and the inner wall of the tubular member on the other. lfn Figs'. 1, 4 and 6 the longitudinally extending ax1s of the longitudinallyextending ltubular portion or member in -which the corresponding diaphragm is located is indicated by and the slope or acute angle which the diaphragm makes with this axis is indicated by a. This angle a .(Figs. 1 and 4) is approximately 15 degrees and if the area of the long narrow slot, which is defined between the diaphragm 3 of Fig. 1 and the diaphragm 29 of Fig. 4 on the one hand and the corresponding longitudinally extending tubular portion within which the diaphragm is located on the other,'is to be such that the smallest area for the flow of gases through the muffler is the area between said inclined diaphragm and the, inner wall of the corresponding tubular member, then it will be readily ascertained mathematicallyl that the dimension I) (which dimension b is the width of the slot or iny other words the distance between the diaphragm on the one hand and the inner wall of the longitudnally extending tubular member on the other) is approximately two millimeters or less in a construction of the size shown in said figures of the drawing. l

ln the construction shownvin Fig. 6 the long narrow slot can. be considered to be formed of two concentric narrow slots, the inner edge of the inner concentric slot being defined by the periphery of the diaphragm member 39 and the outer edge of the outer concentric slot being defined by the upper end of the filler 46; and the" dimension b from the diaphragm to this filler may be considered as the width of the two concentric slots. ln the form shown in Fig. 6 the angle a is approximately 25 degrees and if these two slots are'to provide the smallest area for that the 'intermediate casing member 37 is tapered to a thin edge adjacent to the cooperating edge of the diaphragm 39 whereby the two slotted portions just referred to are merely separated by a thin wall. j

rlhe long narrow slots which have heenreferred to are continuous and extend about the entire periphery of the diaphragm as is readily seen from an inspection of the drawing, and I have found that in a muffler, wherein all the passageways through which the exhaust gases must escape are long slots in which the breadth or width of the slots is two millimeters or less, there is a substantial muffling efect of the noise of the gases as they pass through the muller, this probably due to the expansion and cooling effect on the gases in passing through such narrow slots. The improvements herein set forth are not limited to the precise construction and ar of gases through the space between the longitudinally extending outer vmember and thediaphragm.

2. A muffler comprising a casing having a longitudinally extending tubular portion and an inclined diaphragm secured to said casing, which inclined diaphragm extends adjacent to the wall of the longitudinally extending tubular portion and makes an acute angle of approximately 15 degrees with the longitudinally extending axis of said tubular portion, the construction being such that there is provided between the casing and the diaphragm a long continuous narrow pas-V A sageway of two millimeters or less in width through which flow thel gases passing through the muffler.

3. A muliler of the class described comprising a longitudinally extending tubular member and a member providing an inclined diaphragm portion that approaches the wall of the longitudinally extending tubular member so that there is defined between said members a narrow passageway of two millimeters or less in width.l

4. A muiller of the class described comprising alongitudinally extending tubular member and a member providing an inclined diaphragm portion that approaches the wall of the longitudinally. extending tubular member so that there is dened between said members a narrow passageway of approximately two millimeters or less in'width, the construction being such that the smallest area for the fiow of gases through the muffler is the area between said inclined diaphragm and the wall of said tubular member.

5. A muilieri comprising in combination an outer member having therein an inclined diaphragm member for providing a relatively long narrow space through which gases flowing through the muffler must pass, a third member spaced from said diaphragm member, and means for supplying water t0 the space between said third member and said diaphragm member. i

'6. A muliler of the class described comprising in combination a longitudinally extending casing member, a diaphragm member connected thereto and associated therewith so as to provide a relatively long narrow space between the interior wall portion and the portion of the diaphragm member which is included in a plane that is substantially inclined to the axis of the longitudinally extending member, the construction being such that the passageway between said diaphragm member and said casing member 'sov is otherwise substantially unobstructed, a

lthird member arranged in spaced relation to the diaphragm member, and means for delivering water into the space between said diaphragm member and said third member.

7. A muffler comprising in combination a casing member, a diaphragm member associated therewith having located with the forward end thereof a third member spaced from the diaphragm member, means for supplying water into the space between said third member and the diaphragm member,

and a spiral deflecting member at the delivery end of the diaphragm member.

8. A muier comprising in combination a tubular casing and an inclined diaphragm member associated "therewith which, dia-I 10. A muler in which the passageway. through which the gases passlis defined between a tubular wall and an inclined diaphragm whereby there is provided along continuous narrow slot between the diaphragm and the wall, the construction being such that the width of this slot is approximately two millimeters or less and also such that the smallest area for the flow of gases through the muiller is the area of said slotted portion.

This specification signed and witnessed this 23d day of Mkay, D. 1917.

nLvoR ANDREsEiI.

Signed in the presence of- G. MCGRANN, EDWIN AJR-10mm). 

